'Firm' in the Bible

Put on the whole armor of God so that you may be able to stand firm against the Devil's strategies.

For this reason, take up the whole armor of God so that you may be able to take a stand whenever evil comes. And when you have done everything you could, you will be able to stand firm.

Stand firm, therefore, having fastened the belt of truth around your waist, and having put on the breastplate of righteousness,